Cube allows to define a pre-aggregation with non-unique member references

[igorlukanin]

Describe the bug
Cube allows to define and build a pre-aggregation with non-unique member references (e.g., one dimension referenced twice in the pre-aggregation definition).

To Reproduce

1. Create a cube with at least one dimension
2. Add a rollup pre-aggregation that references this dimension twice and stores pre-aggregation data in CUbe Store
3. Execute a query (Cube will build a pre-aggregation, Cube Store will download the CSV file and store it)
4. The query will yield this error:

Internal: Error during planning: Schema contains duplicate qualified field name "..."

Expected behavior
Cube won't compile the schema with pre-aggregations that have non-unique member references and it will show an error.

Screenshots

Version:
0.28.38

[igorlukanin]

Related: #3485

[igorlukanin]

Still reproduces on Cube v0.36.7.